我正在写两个文件，一个是使用Log_message函数的日志，另一个是我的file_write函数写入OUT，我想逐行写入而不是缓冲，以便逐行写入而不是全部在剧本的最后一步到位。
我已阅读有关缓冲和使文件句柄变热但无法使我的代码工作的信息。
在这个例子中，我在$|=1;循环之前添加了foreach，但它仍然一次写入。我做的事情真的很蠢吗？
如果有帮助的话，我已将整个脚本进一步缩小。
#-----------------------------------------------
sub file_write {
#-----------------------------------------------
open OUT, ">>$OUT" or Log_message ("\n$DATE - $TIME - ERROR - Could not create filelist.doc \t");
Log_message ("\n$DATE - $TIME - INFO - Opened the output file");
my $total = scalar keys %{ $doc->{ resource } };
Log_message ("\n$DATE - $TIME - INFO - Found: " . $total . " resources");
#printf "resources: %s\n", scalar keys %{ $doc->{ resource } };
$|=1;
#And I have also tried:
#use IO::Handle;
#STDOUT->autoflush(1);
foreach ( keys %{ $doc->{ resource } } ) {
#print OUT $doc->{ resource }->{ $_ }->{ id }, "\n";
my $ID = $doc->{ resource }->{ $_ }->{ id }, "\n";
Log_message ("\n$DATE - $TIME - INFO - Found: " . $ID);
my $testurl = "http://dronlineservices.letterpart.com/web/content.xql?action=doc_html&lang=en&pub=" . $pubId . "&docid=" . $ID;
print OUT "$testurl\n";
sleep 1;
}
整个剧本
# !c:/Perl/bin/Perl.exe
#-----------------------------------------------
#Modules
#-----------------------------------------------
use XML::Simple;
use LWP;
use Data::Dumper;
$Data::Dumper::Indent = 1;
$Data::Dumper::Sortkeys = 1;
use strict;
use warnings;
#-----------------------------------------------
#Declare variables
#-----------------------------------------------
my $script = "LiveContent Auto Cache Script"; # Name of the script
my $version = "Version 0.1";
#my $pubId = "COMP-20110922XXXX";
my $pubId = "LiveContentDoc";
my $OUT = "output.txt";
my $LOG = "cacher-log.log"; # Location of log file
my $DATE; # Date in form 2001-sep-01
my $DATENR; # Date in form 2001-01-09
my $TIME; # Time in form 12:04:03
my $txtmesg = "";
my $resource;
my $xs;
my $doc;
####################################
########### Main Program ###########
####################################
error_logger(); # Open Log file and time stamp it
request_url(); #Open the xml url and read it in
file_write(); #write the contents of the xml url to a file
#-----------------------------------------------
sub request_url {
#-----------------------------------------------
my $useragent = LWP::UserAgent->new;
my $request = HTTP::Request->new( GET => "http://digitalessence.net/resource.xml" );
#my $request = HTTP::Request->new( GET => "http://dronlineservices.letterpart.com/web/content.xql?action=index&lang=en&pub=" . $pubId );
$resource = $useragent->request( $request );
$xs = XML::Simple->new();
$doc = $xs->XMLin( $resource->content );
}
#-----------------------------------------------
sub file_write {
#-----------------------------------------------
open OUT, ">>$OUT" or Log_message ("\n$DATE - $TIME - ERROR - Could not create filelist.doc \t");
Log_message ("\n$DATE - $TIME - INFO - Opened the output file");
my $total = scalar keys %{ $doc->{ resource } };
Log_message ("\n$DATE - $TIME - INFO - Found: " . $total . " resources");
#printf "resources: %s\n", scalar keys %{ $doc->{ resource } };
use IO::Handle;
STDOUT->autoflush(1);
foreach ( keys %{ $doc->{ resource } } ) {
#print OUT $doc->{ resource }->{ $_ }->{ id }, "\n";
my $ID = $doc->{ resource }->{ $_ }->{ id }, "\n";
Log_message ("\n$DATE - $TIME - INFO - Found: " . $ID);
my $testurl = "http://dronlineservices.letterpart.com/web/content.xql?action=doc_html&lang=en&pub=" . $pubId . "&docid=" . $ID;
print OUT "$testurl\n";
# my $browser = LWP::UserAgent->new;
# $browser->timeout(240);
# $browser->env_proxy;
# $browser->agent('Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)');
# my $response = $browser->get($testurl);
# if ($response->is_success) {
# print "\n############################\n";
# print "$testurl\n";
# print "\n############################\n";
# print $response->decoded_content; # print the response out
# }
# else {
# my $error = $response->status_line;
# Log_message ("\n$DATE - $TIME - WARN - Can't load $ID because: $error");
# die $response->status_line;
# }
#my $loadrequest = $ua->get('http://dronlineservices.letterpart.com/web/content.xql?action=doc_html&lang=en&pub=" . $pubId . "&docid=" . $ID');
sleep 1;
}
Log_message ("\n$DATE - $TIME - INFO - Written the output file");
#close(OUT) or Log_message ("\n$DATE - $TIME - WARN - Failed to close the Output file");
Log_message ("\n$DATE - $TIME - INFO - Closed the output file");
}
#-----------------------------------------------
sub error_logger {
#-----------------------------------------------
time_stamp(); # Run Time stamp sub
open LOG, ">>$LOG" or die ("could not open log file <$LOG>"); # Open Log File
Log_message ("\n$DATE - $TIME - -----------------------------------------\ \t");
Log_message ("\n$DATE - $TIME - INFO - Start of Application\ \t");
Log_message ("\n$DATE - $TIME - INFO - $script\ \t");
Log_message ("\n$DATE - $TIME - INFO - $version\ \t");
Log_message ("\n$DATE - $TIME - -----------------------------------------\ \t");
}
#-------------------------------------------------------------
sub Log_message {
#-------------------------------------------------------------
time_stamp(); # Run time_stamp every time the log is written to
my($mesg) = @_;
print LOG $mesg if $LOG; # Print to log file
print $mesg; # Print to Screen
$txtmesg = $mesg;
#print "\nLOGGING: $txtmesg\n";
}
#-----------------------------------------------
sub time_stamp {
#-----------------------------------------------
my($Sec,$Min,$Hour,$Day,$MonthNr,$Year) = localtime(time());
my $Month=("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")[$MonthNr];
$Sec = sprintf("%02d",$Sec);
$Min = sprintf("%02d",$Min);
$Day = sprintf("%02d",$Day);
$MonthNr = sprintf("%02d",++$MonthNr);
$Year = 1900 + $Year;
$DATE = "$Year-$Month-$Day";
$DATENR = "$Year-$MonthNr-$Day";
$TIME = "$Hour:$Min:$Sec";
} # end sub
答案 0 :(得分：16)
您忘了先选择手柄。
select( (select(OUT), $| = 1)[0] );
答案 1 :(得分：11)
use IO::Handle;
OUT->autoflush(1);
但最好使用词法文件句柄：
use IO::Handle;
open my $outfh, ">>", $OUT or Log_message ("\n$DATE - $TIME - ERROR - Could not create filelist.doc \t");
$outfh->autoflush(1);